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Summary

Short Citation
OCM Partners, 2024: March 2009 Scripps Institute of Oceanography (SIO) Lidar of the Southern California Coastline: Long Beach to US/Mexico Border, https://www.fisheries.noaa.gov/inport/item/50016.
Full Citation Examples

Abstract

This lidar point data set was collected during low tide conditions along an approximately 500-700 meter wide strip of the Southern California

coastline within an area extending south from Long Beach to the US/Mexico border. Data were collected in Los Angeles, Orange and San Diego

counties from south of the Downtown Long Beach Marina in Long Beach, California to Leucadia on March 8, 2009 between 19:56 and 22:59 UTC.

Data were collected in Orange and San Diego counties from south of Dana Point to north of La Jolla on March 9, 2009 between 21:27 and 23:48 UTC.

Data were collected in San Diego County from south of Del Mar to south of the United States-Mexico border near Playas de Tijuana, Baja California,

Mexico on March 10 between 21:32 and 22:32 UTC. Data set features include water, beach, cliffs, and top of cliffs. The all points data set contains

the complete point cloud of first and last return elevation and laser intensity measurements recorded during the spring 2009 airborne lidar survey

conducted semi-annually by the University of Texas at Austin for the Southern California Beach Processes Study.

The data set was generated by the processing of laser range, scan angle, and aircraft attitude data collected using an Optech Inc. Airborne

Laser Terrain Mapper (ALTM) 1225 system and geodetic quality Global Positioning System (GPS) airborne and ground-based receivers. Instrument

settings and parameters during survey were:

Nominal on-ground beam diameter: 25 cm

Pulse rate: 25 kHz

Maximum number of returns recorded: 2

Minimum separation between detected returns from a single pulse: 4.3 m

Laser wavelength: 1064 nm

Frequency of GPS sampling: 1 Hz

Frequency of IMU sampling: 50 Hz; Scan angle: +/- 20 degrees

Nominal height of instrument above ground: 1100 m

Nominal single-swath pulse density: 2 m

Nominal aggregate pulse density: 0.75

Nature of vertical control: Kinematic and static GPS points

Original contact information:

Contact Name: Roberto Gutierrez

Contact Org: University of Texas at Austin Center for Space Research

Title: Research Associate in Geodesy and Geophysics

Phone: 512.471.5573

Email: oskar@mail.utexas.edu

Distribution Information

  • Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

  • Simple download of data files.

Access Constraints:

None

Use Constraints:

These data were collected to support the Southern California Beach Processes Study. Any conclusions drawn from analysis of this information are

not the responsibility of the Scripps Institution of Oceanography, the UT Center for Space Research, the Bureau of Economic Geology, or the

University of Texas at Austin. Interested parties are advised to review metadata contents prior to use. These data are best used at scales

appropriate for raster or gridded data collected at a nominal resolution of 1-2 meters (approximately 1:12000). Users should be aware

that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface

conditions. Users should not base critical applications on this data set without full awareness of potential limitations.

Controlled Theme Keywords

elevation

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Extents

Geographic Area 1

-118.00024° W, -117.119071° E, 33.659194° N, 32.508919° S

Time Frame 1
2009-03-08 - 2009-03-10

Item Identification

Title: March 2009 Scripps Institute of Oceanography (SIO) Lidar of the Southern California Coastline: Long Beach to US/Mexico Border
Short Name: scripps_200903_m572_metadata
Status: Completed
Publication Date: 2011-03
Abstract:

This lidar point data set was collected during low tide conditions along an approximately 500-700 meter wide strip of the Southern California

coastline within an area extending south from Long Beach to the US/Mexico border. Data were collected in Los Angeles, Orange and San Diego

counties from south of the Downtown Long Beach Marina in Long Beach, California to Leucadia on March 8, 2009 between 19:56 and 22:59 UTC.

Data were collected in Orange and San Diego counties from south of Dana Point to north of La Jolla on March 9, 2009 between 21:27 and 23:48 UTC.

Data were collected in San Diego County from south of Del Mar to south of the United States-Mexico border near Playas de Tijuana, Baja California,

Mexico on March 10 between 21:32 and 22:32 UTC. Data set features include water, beach, cliffs, and top of cliffs. The all points data set contains

the complete point cloud of first and last return elevation and laser intensity measurements recorded during the spring 2009 airborne lidar survey

conducted semi-annually by the University of Texas at Austin for the Southern California Beach Processes Study.

The data set was generated by the processing of laser range, scan angle, and aircraft attitude data collected using an Optech Inc. Airborne

Laser Terrain Mapper (ALTM) 1225 system and geodetic quality Global Positioning System (GPS) airborne and ground-based receivers. Instrument

settings and parameters during survey were:

Nominal on-ground beam diameter: 25 cm

Pulse rate: 25 kHz

Maximum number of returns recorded: 2

Minimum separation between detected returns from a single pulse: 4.3 m

Laser wavelength: 1064 nm

Frequency of GPS sampling: 1 Hz

Frequency of IMU sampling: 50 Hz; Scan angle: +/- 20 degrees

Nominal height of instrument above ground: 1100 m

Nominal single-swath pulse density: 2 m

Nominal aggregate pulse density: 0.75

Nature of vertical control: Kinematic and static GPS points

Original contact information:

Contact Name: Roberto Gutierrez

Contact Org: University of Texas at Austin Center for Space Research

Title: Research Associate in Geodesy and Geophysics

Phone: 512.471.5573

Email: oskar@mail.utexas.edu

Purpose:

The data described in this document will be compared with previous and forthcoming data sets to determine rates of shoreline change along the

Southern California coastline. The SCBPS program is designed to improve the understanding of beach sand transport by waves and currents, thus

improving local and regional coastal management.

Notes:

10660

Supplemental Information:

The University of Texas at Austin Center for Space Research operated an Optech Inc. Airborne Laser Terrain Mapper (ALTM) 1225 system installed

in a single engine Cessna 206 to collect lidar data for the survey. Global Positioning System (GPS) data were collected simultaneously with

three geodetic quality Ashtech Z-12 receivers installed in the aircraft and at two temporary base stations operated during the survey. An

Inertial Measurement Unit (IMU) used three orthogonal accelerometers and gyroscopes to collect in-flight instrument orientation information.

The Cessna 206 aircraft used in the survey is owned and operated by the Texas Department of Transportation.

The ALTM 1225 (SN#99d118) lidar instrument has the following specifications: operating altitude = 410-2,000 m AGL; maximum laser pulse

rate = 25 kHz; laser scan angle = variable from 0 to +/-20deg from nadir; scanning frequency = variable, 28 Hz at the 20deg scan angle; and

beam divergence: narrow = 0.2 milliradian (half angle, 1/e). The ALTM 1225 records the range and backscatter intensity of the first and last

laser reflection using an Avalanche Photo diode constant-fraction discriminator and two Timing Interval Meters (TIM).

ALTM elevation points are computed using three sets of data: laser ranges and their associated scan angles, platform position and orientation

information, and calibration data and mounting parameters (Wehr and Lohr, 1999). Global Positioning System (GPS) receivers in the aircraft and

on the ground provide platform positioning. The GPS receivers record pseudo-range and phase information for post-processing. Platform orientation

information comes from an Inertial Measurement Unit (IMU) containing three orthogonal accelerometers and gyroscopes. An aided-Inertial

Navigation System (INS) solution for the aircraft's attitude is estimated from the IMU output and the GPS information.

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/572/supplemental/Scripps_March_2009_Lidar_Long_Beach_to_Mexico_Border.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Beaches
None Coastal Landforms/Processes
None GPS
None GPS Receivers
None Landforms
None Shorelines

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 2009
None low tide
None March

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Distribution Liability:

Any conclusions drawn from analysis of this information are not the responsibility of the Scripps Institution of Oceanography, the UT Center for

Space Research, the Bureau of Economic Geology, The University of Texas at Austin or the NOAA Office for Coastal Management or its partners.

Data Set Credit: This dataset was generated for the Scripps Institution of Oceanography by the Center for Space Research, the University of Texas at Austin (CSR), with support provided by the Bureau of Economic Geology, the University of Texas at Austin (BEG), and the Government Flight Services of the Texas Department of Transportation. Acknowledgement of the data originators is requested when using the data set as a source.

Support Roles

Data Steward

CC ID: 687113
Date Effective From: 2011-03
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 687115
Date Effective From: 2011-03
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 687116
Date Effective From: 2011-03
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 687114
Date Effective From: 2011-03
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1139239
W° Bound: -118.00024
E° Bound: -117.119071
N° Bound: 33.659194
S° Bound: 32.508919

Extent Group 1 / Time Frame 1

CC ID: 1139238
Time Frame Type: Range
Start: 2009-03-08
End: 2009-03-10

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

;

Data Access Constraints:

None

Data Use Constraints:

These data were collected to support the Southern California Beach Processes Study. Any conclusions drawn from analysis of this information are

not the responsibility of the Scripps Institution of Oceanography, the UT Center for Space Research, the Bureau of Economic Geology, or the

University of Texas at Austin. Interested parties are advised to review metadata contents prior to use. These data are best used at scales

appropriate for raster or gridded data collected at a nominal resolution of 1-2 meters (approximately 1:12000). Users should be aware

that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface

conditions. Users should not base critical applications on this data set without full awareness of potential limitations.

Distribution Information

Distribution 1

CC ID: 742617
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=572
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 742618
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/572/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 742620
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 742621
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 687174
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 687173
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718617
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742619
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Maximum allowable PDOP using a 15 degree elevation mask during data collection was 3.5. The lidar data is estimated to have a horizontal

error of less than or equal to 1.0 m. To assess horizontal accuracy, selected portions from each lidar data set (last return only) were used

to generate a 1m x 1m digital elevation model (DEM). Data from ground surveys conducted using kinematic GPS techniques and estimated to have

a horizontal accuracy of 0.01-0.03 m were superimposed on the lidar DEM and examined for any mismatch between the horizontal position of the

ground GPS and the corresponding feature on the lidar DEM. Horizontal agreement between the ground kinematic GPS and the lidar was within

the resolution of the 1m x 1m DEM.

Vertical Positional Accuracy:

(North) The March 8, 2009, lidar data were compared to kinematic GPS ground survey points collected along an approximately 2 kilometer long

stretch of the East Pacific Coast Highway near Laguna Beach. The March 8, 2009, lidar data set was sorted to find data points that fell

within 1 m of the GPS points.

(South) The March 9 and 10, 2009, lidar data were compared to 17 GPS ground survey points collected throughout a parking lot adjacent to the

North Torrey Pines Road. The March 9 and 10, 2009, lidar data sets were sorted to find data points that fell within 2 m of the GPS points.

For each survey area (north and south), the mean elevation difference between the selected lidar points and their respective GPS points was

used to estimate and remove elevation bias from the lidar. The standard deviation of the elevation differences provided estimates of the

lidar precision. The bias was removed so that mean lidar elevations have a vertical accuracy of 0.10 m RMSE.

Completeness Report:

This data set contains data within a narrow strip (~700 m) of the Southern California coastline. A decimated dataset was visually inspected for

completeness. Some beach edges may be missing. Data collected west of the northwestern corner of the Downtown Long Beach Marina

(Longitude 118d11m0.63s W) and south of the US-Mexico border at Playas de Tijuana (Latitude 32d32m1.80s N) may be of poor quality and should not

be used for analysis. Discretion should be used with data collected during pass 06709B and during the end of pass 06709A as position

accuracies are near thresholds set for acceptable RMS.

Conceptual Consistency:

Data points lacking either first or last return values were removed from the data set. An automated method was used to remove obvious outliers.

Only data points with vertical values greater than or equal to -20 m and less than or equal to 250 m were retained in the all points data set.

Lineage

Sources

Air and Ground GPS L1, L2, pseudorange and phase files from March 8, 9 & 10, 2009 (Days of Year 67, 68 & 69)

CC ID: 1139229
Extent Type: Range
Extent Start Date/Time: 2009-03-08
Extent End Date/Time: 2009-03-10
Source Contribution:

Two Ashtech Z-12 GPS receivers placed at precisely located base stations collected GPS data at 1 second intervals throughout the period

of airborne lidar data collection. Data collection commenced prior to take off and ceased subsequent to touch down. A third Ashtech Z-12

GPS receiver collected in-flight GPS data at 1 second intervals. Data were downloaded and stored each day after flight completion. File names

included standardized references to location and date. These data were used for ALTM range file processing. See process steps for more detailed

information.

GPS base station locations by survey day:

March 8 (day 067), 2009: SANO, SEAL

March 9 (day 068), 2009: SANO, LOMA

March 10 (day 069), 2009: PIER, LOMA

GPS base station attributes:

ID: SANO

Name: HPGN-CA SDGPS01, 1990; Description: San Diego County Engineer Department GPS control point at San Onofre

NAD83 Coordinates and HAE: 33d 22m 31.08420s N, 117d 33m 54.54673s W, -5.17

ID: SEAL

Name: HPGN CA 12 01; Description: California High Precision GPS Network 12 01 (PID:DY9309)

NAD83 Coordinates and HAE: 33d 44m 15.03481s N, 118d 05m 17.76708s W, -27.228

ID: LOMA

Name: LOMA EAST; Description: NGS Control Point at Loma Point, LOMA EAST, 1994 (PID: AC6092)

NAD83 Coordinates and HAE: 32d 40m 13.99579s N, 117d 14m 27.74509s W, 90.892

ID: PIER

Name: 230 S, 2000; Description: Tidal benchmark on Scripps Pier, no published PID

NAD83 Coordinates and HAE: 32d 51m 59.68409s N, 117d 15m 19.92726s W, -25.426

| Type of Source Media: digital files

ALTM 1225 range files

CC ID: 1139228
Extent Type: Range
Extent Start Date/Time: 2009-03-08
Extent End Date/Time: 2009-03-10
Source Contribution:

Range files are the source data collected by the ALTM 1225 sensor.

ALTM 1225 range files used for this survey are grouped by date, day of year, pass, pass location, and time of collection (all times UTC):

Spring 2009

March 8, 2009 (Day of Year = 67), HH:MM in UTC

===================================================

06709 Pass A (Leucadia to Long Beach) 19:56-20:41

06709 Pass B (Long Beach to Dana Point) 20:44-21:04

06709 Pass C (Dana Point to Long Beach) 21:07-21:39

06709 Pass D (Long Beach to Oceanside) 21:42-22:21

06709 Pass E (Oceanside to Dana Point) 22:25-22:39

06709 Pass F (Dana Point to Oceanside) 22:42-22:59

March 9, 2009 (Day of Year = 68), HH:MM in UTC

===================================================

06809 Pass A (Carlsbad to Dana Point) 21:27-21:46

06809 Pass B (Dana Point to La Jolla Bay) 21:49-22:19

06809 Pass C (La Jolla to Dana Point) 22:29-22:58

06809 Pass D (Dana Point to La Jolla Bay) 23:00-23:29

06809 Pass E (La Jolla to Oceanside) 23:32-23:48

March 10, 2009 (Day of Year = 69), HH:MM in UTC

===================================================

06909 Pass A (Coronado (Glorietta Bay Park) to Playas de Tijuana) 21:32-21:37

06909 Pass B (Playas de Tijuana to Coronado (North Island NAS)) 21:41-21:49

06909 Pass C (Coronado (North Island NAS) to Playas de Tijuana) 21:54-22:04

06909 Pass D (Point Loma to Del Mar (south city limit)) 22:11-22:32

| Source Geospatial Form: tabular digital data | Type of Source Media: digital files

GPS Continuously Operating Reference Station (CORS) at Pinyon Flats, CA

CC ID: 1139230
Extent Type: Range
Extent Start Date/Time: 2009-03-08
Extent End Date/Time: 2009-03-10
Source Contribution:

GPS base stations solutions were estimated with respect to the GPS Continuously Operating Reference Station (CORS) at Pinyon Flats, CA.

DESIGNATION: PINON 1 PGGA CORS ARP

CORS_ID: PIN1

NGS PID: AF9708

| Type of Source Media: online

Process Steps

Process Step 1

CC ID: 1139231
Description:

ALTM range files were downloaded from the Optech ALTM 1225 system and decoded using Optech's REALM 3.0 tape decode program.

Process Step 2

CC ID: 1139232
Description:

Raw GPS data were downloaded from three Ashtech Z-12 GPS receivers. One receiver collected in-flight aircraft data; the other two collected

data during flight time at separate base stations. The GPS data were converted into RINEX2 format with pseudorange smoothing applied. The

National Geodetic Survey's PAGES-NT software was used to compute double differenced, ionospherically corrected, static GPS solutions for each

GPS base station with precise ephemerides from the International GPS Service (IGS) with respect to selected CORS sites. As part of the solution

tropospheric zenith delays were estimated and L1 and L2 phase biases were fixed as integers. Aircraft trajectories were estimated with respect

to all base stations using National Geodetic Survey's Kinematic and Rapid-Static Software (KARS) software. Trajectories were double-differenced,

ionospherically corrected, bias-fixed GPS solutions computed with precise IGS ephemerides. Coordinates for base stations and trajectories were

in the International Terrestrial Reference Frame of 2000 (ITRF00). Aircraft trajectories were transformed from the ITRF00 to North American

Datum of 1983 (NAD83) using the Horizontal Time Dependent Positioning (HDTP) software (Snay, 1999).

Process Step 3

CC ID: 1139233
Description:

The 1 Hz GPS trajectory and 50Hz aircraft inertial measurement unit (IMU) data were combined in Applanix's POSProc version 4.2 to compute an

aided inertial navigation solution (INS) and a 50 Hz, smoothed best estimate of trajectory (SBET). The POSPac software employs a Kalman filter

to obtain a blended navigation solution. Afterwards, smoothing was applied to the solution to obtain the SBET for the aircraft.

Process Step 4

CC ID: 1139234
Description:

The SBET, laser range observations, scanner position information, and GPS/internal clock files were processed in the Realm 2.27 software suite

to generate uncalibrated lidar data points in the Universal Transverse Mercator (UTM) projection. Lidar point data were compared to 1998

ATM LIDAR data over several cross-track piers and roads to estimate lidar instrument calibration parameters: roll and pitch biases, scanner

scale factor, and first/last return elevation biases. An iterative, least-squares methodology was used to estimate calibration parameters so

as to minimize differences between lidar and ground GPS data.

Samples of lidar data were used to create high-resolution digital elevation models (DEM); these DEMs were inspected for horizontal or vertical

anomalies. Data collected on March 8, 2009, were compared to kinematic GPS points collected along the E. Pacific Coast Hwy near Laguna Beach.

Data collected on March 9 and 10, 2009, were compared to kinematic GPS points collected in a parking lot near North Torrey Pines Road. After

system calibration and initial quality control step, the adjusted lidar x,y,z-point data were generated by REALM software and output using

the UTM Zone 11 coordinate system with elevations being heights above the GRS-80 reference ellipsoid (HAE).

The output format from REALM 2.27 is a headerless space-delimited 9-column ASCII file that contains:

Column 1 = the point time tag in seconds in the GPS week;

Columns 2-4 = the UTM Zone 11 North easting, UTM Zone 11 North northing and height above ellipsoid (HAE) of the first lidar return;

Columns 5-7 = the UTM Zone 11 North easting, UTM Zone 11 North northing and HAE of the last lidar return; and

Columns 8 & 9 = the laser backscatter intensity of the first and last returns.

Process Step 5

CC ID: 1139235
Description:

Heights above the GRS80 ellipsoid (HAE) were converted to orthometric heights with respect to the North American Vertical Datum of

1988 (NAVD88), using the GEOID99 model. GPS time tags were used to separate the data collected on a single day into distinct passes. The

resulting pass data sets were then parsed into 3.75-minute USGS quarter-quadrangle components containing the complete point cloud. Each output

file includes data points found within a 20 meter buffer area surrounding each quarter quadrangle. Outlier data points that exceeded designated

elevation thresholds (< -20 m or > 250 m) were eliminated during the parsing process.

Process Step 6

CC ID: 1139236
Description:

The NOAA Office for Coastal Management (OCM) received the lidar files in ASCII format. The files contained lidar intensity

and elevation measurements. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. Data converted from UTM coordinates to geographic coordinates.

2. Data converted from NAVD88 heights to ellipsoid heights using GEOID99.

3. Data converted from dual return xyz format to xyz text format with return numbers to las format.

4. The LAS data were sorted by latitude and the headers were updated.

Process Date/Time: 2011-03-01 00:00:00

Catalog Details

Catalog Item ID: 50016
GUID: gov.noaa.nmfs.inport:50016
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:23+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16